Usb Video Archiecture

Usb Capture Stream:

The webcam (usb_camera) has two import components. one is DSP, another is sensor in firmware based on Uvc spec.

1. original light --> lens --> sensor --> dsp --> usb --> computer

1. computer (windows) --> uvc driver --> directshow --> amcap
2. computer (linux) --> kernel --> uvc driver --> v4l2 --> /dev/video

STILL_IMAGE_FRAME